Description: http://earthquake.usgs.gov/research/data/
Past 14 days. Using the publically available software QDDS and QDM, we maintain a catalog of earthquakes that merges the catalogs of the NEIC with those of the US Advanced National Seismic System (ANSS) regional networks. The catalog is preliminary and dynamic. It is continually being updated as event parameters are updated, new events are added, and, occasionally, events are deleted. Although the events contributed by the NEIC are always reviewed by an analyst, some of the regional networks submit computer generated solutions initially, which are later replaced by reviewed solutions. This file is intended to be read by computer programs. Description of format for ASCII file. A more readable format is also available. ftp://hazards.cr.usgs.gov/cnss/cnss_14.fing

Anthony,
Excellent addition to your set of reference pages. But scanning the list I don’t see the magnetometer chains. These are groups of magnetometer sensors, spread out over the globe, that report back their readings to their governing agency (usually at the national government level).

These groups provide the raw data for computing the various indices, such as Ap and Kp. But it’s interesting to watch them during a magnetic storm to get an idea of the strength and locality. (Not all geomagmetic disturbances come from the Sun).

Here’s a bunch that I use for reference:

U.S. Ge0logical service: http://geomag.usgs.gov/realtime/ (These are arranged so that the northern-most (“arctic”) sensors are at the top, but cover a lot of the Northern Hemisphere, from Guam to Alaska to Puerto Rico)

Japanese: http://kogma.nict.go.jp/cgi-bin/geomag-interface (A little harder to use because you have to select the sensor from a list and look at them one at a time. But this came in handy during the X2.2 flare, which hit on the Asian side. You could clearly see the effect of the flare on magnetic readings)

HAARP: http://www.haarp.alaska.edu/haarp/data.html (HAARP has its own chain of magnetometers, including a very sensitive inductive magnetometer which can pick up ULF pulsations. [Be sure to wear a tin-foil hat when you visit this site, they can read your minds you know!])

After having read a local story about a runway at Merrill Field changing its runway designation, I became curious again about magnetic north.It led me to find that there is striking similarities between the 10th and 11th generation of the IGRF. What I didn’t expect was that the last 7 years of calculations from each are identical in overall length and between years. Only that the 11th generation is 80km farther along the drift line than the 10th generation.
Read about it at this shortlink: http://wp.me/pOWA1-bO